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Different forms of soluble PD-L1 in patients with stage I-III colorectal cancer. a PD-L1 expression in exosomes characterized by transmission electron microscope (TEM), nanoparticle tracking analysis (NTA) and western blot (WB). b secPD-L1 level was significantly higher than exoPD-L1 (n = 30) and secPD-L1 was positively correlated to sPD-L1 (n = 60). R and P were calculated by Spearman correlation
